360 stroker kit in 340

I decided against getting the crank and just gonna build the 340, gonna to get it set up for a roller. Would a 360 magnum cam fit into an la block without any modifications?I found someone selling a Howard’s roller new in box for a magnum and just wonder how it would work. I also dont have any rotating assembly so I’m deciding on whether to put 4” or 3.58” stroke kit in it. What’s everyone’s take on both?

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